acronn.

Brit.

/ˈakrɒn/,

/ˈakr(ə)n/, U.S.

/ˈæˌkrɑn/,

/ˈækrən/

Origin: A borrowing from French. Etymon: French acron.

Etymology: < French acron (C. Janet 1898, in Mém. de la Société Zoologique de France 11 393) < ancient Greek ἄκρον extremity, use as noun of neuter of ἄκρος highest, topmost (see acro- comb. form).

Zoology.

In an arthropod: the unsegmented region at the anterior end of the body; spec. the prostomial region of an arthropod embryo.

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > [noun] > member of > parts of > anterior division of body > unsegmented region

acron1901

1901 Jrnl. Royal Microsc. Soc. 147 It is not difficult to distinguish six divisions..; but Janet raises the total to nine by analysing the acron into four somites.

1934 A. D. Imms Gen. Textbk. Entomol. (ed. 3) ii. 177 It is not regarded as a true segment but rather as a pre-oral outgrowth—the acron of Heymons.

1964 R. M. Fox & J. W. Fox Introd. Compar. Entomol. ii. 43 The antennae are thought to belong to the acron and thus not to be true segmental appendages.

1992 Development 115 239/1 The anterior system controls the gnathal and thoracic regions..i.e., the acron (defined here as the brain and parts of the head skeleton).

This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).

单词	acron
释义	acronn. Brit. /ˈakrɒn/, /ˈakr(ə)n/, U.S. /ˈæˌkrɑn/, /ˈækrən/ Origin: A borrowing from French. Etymon: French acron. Etymology: < French acron (C. Janet 1898, in Mém. de la Société Zoologique de France 11 393) < ancient Greek ἄκρον extremity, use as noun of neuter of ἄκρος highest, topmost (see acro- comb. form). Zoology. In an arthropod: the unsegmented region at the anterior end of the body; spec. the prostomial region of an arthropod embryo. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > [noun] > member of > parts of > anterior division of body > unsegmented region acron1901 1901 Jrnl. Royal Microsc. Soc. 147 It is not difficult to distinguish six divisions..; but Janet raises the total to nine by analysing the acron into four somites. 1934 A. D. Imms Gen. Textbk. Entomol. (ed. 3) ii. 177 It is not regarded as a true segment but rather as a pre-oral outgrowth—the acron of Heymons. 1964 R. M. Fox & J. W. Fox Introd. Compar. Entomol. ii. 43 The antennae are thought to belong to the acron and thus not to be true segmental appendages. 1992 Development 115 239/1 The anterior system controls the gnathal and thoracic regions..i.e., the acron (defined here as the brain and parts of the head skeleton). This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021). < n.1901
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